cmake_minimum_required(VERSION 3.16)

function( dualBoot BL_TYPE )
    if( BL_TYPE MATCHES "bootloader" )
        target_link_options( ${PROJECT_NAME} PUBLIC "-Wl,--defsym,BL=1" )
    elseif( BL_TYPE MATCHES "application" )
        target_link_options( ${PROJECT_NAME} PUBLIC "-Wl,--defsym,APP=1" )
    else()
        message( FATAL_ERROR "### Unknown bootloader type: ${BL_TYPE}" )
    endif()
endfunction()


project( foo1 )

add_executable(
    ${PROJECT_NAME}
    main.cpp
)

dualBoot ( application )


#------------------------------------------------------------------------------

project( foo2 )

add_executable(
    ${PROJECT_NAME}
    main.cpp
)

dualBoot ( bootloader )


#------------------------------------------------------------------------------